[headers,diff.mods.to.headers] Reflect new status of <stdatomic.h>.

Author: jensmaurer

source/compatibility.tex

@@ -2666,9 +2666,7 @@
 
 \pnum
 There are no \Cpp{} headers for the C standard library's headers
-\libnoheader{stdatomic.h},
-\libnoheader{stdnoreturn.h},
-and \libnoheader{threads.h},
+\libnoheader{stdnoreturn.h} and \libnoheader{threads.h},
 nor are these headers from the C standard library headers themselves part of \Cpp{}.
 
 \pnum

source/lib-intro.tex

@@ -1012,7 +1012,6 @@
 \begin{footnote}
 It is intentional that there is no \Cpp{} header
 for any of these C headers:
-\libnoheader{stdatomic.h},
 \libnoheader{stdnoreturn.h},
 \libnoheader{threads.h}.
 \end{footnote}
@@ -1046,6 +1045,7 @@
 \tcode{<cuchar>} \\
 \tcode{<cwchar>} \\
 \tcode{<cwctype>} \\
+\libheader{stdatomic.h}
 \end{multicolfloattable}
 
 \pnum